Conferences Are Coming
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The designations "National Electrical Code" and "NEC" refer to the
National Electrical Code®, which is a registered
trademark of the National Fire Protection Association.
NEC in the Facility
Surge Arrester Basics
The actual connection of surge arresters can be
confusing. Thus, you must read Art. 280, Part II, carefully to get this
In the NEC and other standards, the word "grounding" is often
to mean "bonding." That isn't the case in Art. 280. It really does mean
grounding (per Art. 100, "grounding" is an earth connection).
Your decision on where to locate surge arresters has to account for
your intended wiring scheme, keeping in mind that you want the
conductor(s) to be as short as is practical [280.12]. You can locate
surge arresters indoors or outdoors, but either way you have to make
them inaccessible to unauthorized personnel [280.11] (unless you get
surge arresters listed for installation in accessible locations and
comply with the installation instructions for those).
The grounding connection is crucial. Remember: The grounding
conductor of a surge protector is not the same thing as an equipment
"grounding" (bonding) conductor (EGC). With an EGC, you are eliminating
differences of potential. Connecting an EGC to ground doesn't do
anything but waste wire. However, with the surge protector, you are
actually intending to establish a path to earth. Toward that end, 280.4
provides seven variations of such a path.
Perform two-man jobs alone.
Now you can work in two
places at once. With the new Fluke 233 Wireless Remote Display
Multimeter you don’t need the help of another person when reading the
What's Wrong Here?
By Brian J. McPartland
Think you know how this installation violates the
Web site to see the answer.
Hint: Protect and serve
Cool Electronic Cabinets
Stop electronic control
downtime due to heat, dirt and moisture. Cabinet Cooler® Systems from
EXAIR produce 20 degree Fahrenheit air from an ordinary supply of
compressed air to cool electrical controls. Thermostat control
air usage. Cabinet Coolers are UL Listed and maintain the NEMA 4, 4X
12 rating of the enclosure. Web site offers detailed information, a
video, CAD drawings, and PDF literature. http://www.exair.com/15/540_08b.htm
By Mike Holt
Q. Is the electrical wiring system used to feed
ceiling fixtures allowed to be supported by the ceiling support wires?
Visit EC&M's Web
site to see the answer.
By Steven Owen
With respect to interconnected electric power
sources (Art. 705), is it required to automatically disconnect a
primary power source from all ungrounded conductors when one of the
phases opens to create a loss of power on one or more phases? For this
example, exclude emergency or legally required standby systems — and
exclude the exception for this rule.
- Yes, as per Sec. 705.42.
- No. This applies to single-phase systems only.
- No. This applies to 2-phase, 5-wire systems only.
- No. There is no such requirement in the 2008 NEC. This is
a "best practice" suggestion.
Web site for the answer and explanation.
Shows and Events
Code Change Conferences Are
The 2011 NEC is coming. Will you be ready for the
changes? By attending one of EC&M's Code Change Conferences,
presented by NEC expert Mike Holt and sponsored by EC&M University, you'll
learn everything you need to know about major NEC changes that will
impact your work, whether you're an electrician, electrical engineer,
electrical designer, plant/facility electrical maintenance person, or
electrical inspector. Check out the following conferences for a
and time that's right for you.
- Atlanta — October 11-12, 2010, Crowne Plaza Atlanta
- St. Louis — October 18-19, Sheraton Westport Hotel
- Chicago — November 1-2, Hyatt Regency Rosemont
- Seattle —November 8-9, Hilton Seattle Airport & Conference
- Philadelphia —November 29-30, Hilton Philadelphia City
- Boston —December 6-7, Venue to be determined
- Orlando —December 13-14, Hyatt Regency Orlando
If you’re a registered professional engineer and attend one of the
2011 NEC Code Change Conferences, you'll be granted professional
development hours (PDHs), a requirement for re-licensing. The program
also certified as an approved provider of Code Update training by those
states requiring continuing education hours for re-licensing of
journeymen, master electricians, and electrical contractors.
Register now to
attend one of the these events. For more details on the conferences and
a full program, visit EC&M's website.
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